Coil unit

Abstract

A coil unit includes a ferrite including a coil base in a form of a frame, on which a coil is arranged, and formed from a plurality of divided ferrites. The plurality of divided ferrites include a first divided ferrite and a second divided ferrite which form a corner piece and a third divided ferrite and a fourth divided ferrite which form a side piece.

What is claimed is: 
     
       1. A coil unit comprising:
 a coil; and 
 a ferrite including a coil base in a form of a frame, on which the coil is arranged, and formed from a plurality of divided ferrites, 
 the coil base including a plurality of corner portions, 
 the coil base including a plurality of corner pieces which form the corner portion and are provided at a distance from each other and side pieces provided between the corner pieces, 
 the divided ferrite including a short side portion, a long side portion provided at a distance from the short side portion and being longer than the short side portion, a first side portion connecting one end of the short side portion and one end of the long side portion to each other, and a second side portion connecting the other end of the short side portion and the other end of the long side portion to each other and being longer than the first side portion, 
 the plurality of divided ferrites including a first divided ferrite and a second divided ferrite which form the corner piece and a third divided ferrite and a fourth divided ferrite which form the side piece, 
 the first divided ferrite and the second divided ferrite being arranged such that the second side portions are opposed to each other, an inner peripheral side of the corner piece being formed from a short side portion of the first divided ferrite and a short side portion of the second divided ferrite, and an outer peripheral side of the corner piece being formed from a long side portion of the first divided ferrite and a long side portion of the second divided ferrite, and 
 the third divided ferrite and the fourth divided ferrite being arranged such that the second side portions are opposed to each other, an inner peripheral side of the side piece being formed from a short side portion of the third divided ferrite and a long side portion of the fourth divided ferrite, and an outer peripheral side of the side piece being formed from a long side portion of the third divided ferrite and a short side portion of the fourth divided ferrite. 
 
     
     
       2. The coil unit according to  claim 1 , wherein
 the ferrite includes a central ferrite arranged to be in contact with an inner peripheral portion of the coil base and surrounded by the coil, 
 the central ferrite includes a plurality of corner portions, 
 the central ferrite includes a plurality of central corner pieces which form the corner portion of the central ferrite and are arranged in a form of a frame, and 
 the plurality of divided ferrites include a fifth divided ferrite and a sixth divided ferrite which form the central corner piece, the fifth divided ferrite and the sixth divided ferrite are arranged such that the second side portions are opposed to each other, an inner peripheral side of the central corner piece is formed from a short side portion of the fifth divided ferrite and a short side portion of the sixth divided ferrite, and an outer peripheral side of the central corner piece is formed from a long side portion of the fifth divided ferrite and a long side portion of the sixth divided ferrite.